[dnl]

Our 2009 Outlook has had an intermittent problem for about a month now. The engine light will come on and the car has code P0301 "Cylinder#1 misfire". It will stay on a few days and turn off, but come one again a few days later. We have had it to the dealer 4 times. Two times the light was off so they couldn't do anything. The other times they saw the code and changed the plug twice and the coil once. The light came on again with the same code. Has anyone else had this? If so, how was it fixed?

 

[gig229]

I had this problem in my 09 Enclave, but I believe the code I got was P0300. I had a misfire that I could feel when I was on the freeway - the engine was stumbling and had much less power. The dealership had found an open circuit on cylinder 1 so they replaced the coil. So far it has been working fine. I have read that this might be the start of a problem with the timing chain, but usually it's a different code. Did they check the fuel injector? I've seen this problem come up as well.

The dealership mechanic could hook up the Tech 2 machine to the car while it's running (even while someone drives it around) to really see what's happening, but most don't want to spend the time doing diagnostics. It sounds like they're doing the old "throw parts at the problem" trick because they are too lazy to do proper diagnosis.

 

[dnl]

I have been told by two dealerships that if the engine light is not on, that they can't trouble shoot it any further than the coil and plug they have already replaced.
The problem is that this is very intermittent. The engine light comes on, but then in a day or sometimes the same day it turns off. We are unable to get to the dealership when it is still on.
Has anyone seen this before, or have any suggestions?

 

[salguod]

I think I read on the forums (either here or the Acadia) that the P0300 is a general code for misfiring while P0301 means cylinder 1, P0302 is cylinder 2, etc. Seems to match what you folks posted above.